Comparative experimental study on machining edge of carbide end milling cutter with different tool passivation methods
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摘要: 随着制造业的飞速发展,加工中对刀具性能的要求越来越高,而刃口钝化技术是改善刀具性能的关键。本研究提出了一种新型刀具钝化方法,即淀粉基磨粒流钝化法,为刀具刃口钝化提供了一种新的手段。试验采用单因素试验法,通过立式旋转钝化法和淀粉基磨粒流钝化法钝化硬质合金立铣刀进行试验对比分析。试验结果表明:未钝化的刀具刃口半径值最小,且存在很多缺陷,刃型呈尖锐型;立式旋转钝化法得到的刃口半径值变化较小,但刀具刃口缺陷仍然存在,刃型呈现不均匀的钝圆型;淀粉基磨粒流钝化法处理后的刃口半径值变化最大,去除了部分刃口缺陷,刃型呈现出均匀的钝圆型。因此,淀粉基磨粒流钝化法不仅可以更好地去除刀具刃口的表面缺陷,同时有着更高的钝化效率以及刃口半径变化率。考虑刀具生产需要,选择淀粉基磨粒流钝化法可以显著提高刀具性能,降低刀具磨损并改善加工质量。Abstract: With the rapid development of manufacturing industry, the tool performance is more and more demanding in processing, and the cutting edge passivation technology is the key to improve the tool performance. In this study, a new tool passivation method, namely starch based abrasive flow passivation method, is proposed, which provides a new method for tool edge passivation. Single factor test method was used to passivate carbide end milling cutter by vertical rotation passivation method and starch based abrasive flow passivation method. The test results show that the radius of the cutting edge of the unpassivated tool is the smallest, and there are many defects, and the edge shape is sharp. The radius of cutting edge obtained by vertical rotating passivation method changes little, but the defect of cutting edge still exists, and the blade shape presents uneven blunt circular shape. After starch-based abrasive flow passivation, the edge radius changed the most, some edge defects were removed, and the edge shape showed a uniform blunt circular shape. Therefore, the starch-based abrasive flow passivation method can not only remove the surface defects of the cutting edge better, but also has higher passivation efficiency and the change rate of the cutting edge radius. Considering the needs of tool production, the starch-based abrasive flow passivation method can significantly improve tool performance, reduce tool wear and improve machining quality.
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